Wednesday may have been the opening day of spring practice for the Nebraska football team, but that didn't stop head coach Bill Callahan from pushing his team through what looked like to be a mid-season workout.

The Huskers conducted their first of 15 official spring practices on Wednesday and Callahan said he picked things right up from where the team left off at the Cotton Bowl this past January.

"There was a lot of system in today," Callahan said. "There were quite a bit of plays we threw in for the first day. There were a lot of shifts and motions. We did not hold back from our package from where we ended the season against Auburn.

"We picked up the installation for the first day as if we were concluding the last day of practice. Nothing has been held back and we are starting to accelerate and trying to take a step within our own system."

For senior quarterback Sam Keller, that meant there wasn't much of a learning curve for his first official spring practice in a Husker uniform.

Keller said he was thrown right into the fire on Wednesday. The challenging thing for Keller was Wednesday was really the first time he stepped out on the field in a situation as the No. 1 quarterback at Nebraska.